new个二维数组

#define N 5

#define M 5

#define L 5

int** a= new int*[N ];

for (int i = 0; i < N ; ++i)
{
a[i] = new int[M];
}
delete的时候，反过来就行了：
for (int i = 0; i < N; ++i)
{
delete[] a[i];
}
delete[] a;
三维数组，与此相同，举例如下：
int*** a= new int**
;
for (int i = 0; i < N; ++i)
{
a[i] = new int*[M];
for (int j = 0; j < M; ++j)
{
a[i][j] = new int[L];
}
}
for (int i = 0; i < N; ++i)
{
for (int j = 0; j < M; ++j)
{
delete[] a[i][j];
}
delete[] a[i];
}
delete[] a;